Sighting system



FIG. 1 is a perspective view of a sighting system, showing my new design;

FIG. 2 is a first side elevational view thereof;

FIG. 3 is a second side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top elevational view thereof; and,

FIG. 7 is a bottom elevational view thereof.

The broken line showings in the Figures are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a sighting system, as shown and described. 